ppl. a. (UN-1 8.)
1770. Glover, Leonidas (ed. 5), VI. 418. They well may keep the field, Who with unslakend [1772 unslackend] nerves endurd that day.
1844. Mrs. Browning, Sonn., Patience, 7. Ocean girds Unslackened the dry land.
1870. Daily News, 23 April. He drove down a narrow road followed by the waggon and horses with unslackened speed.
1890. R. Boldrewood, Miners Right, xlii. Still the quartz-crushing machine went thundering on unchecked, unslackened.